Safety handwheel for feeding drills



Jan. 1, 1924 D. c. KLAusME iER SAFETY HANDWHEEL FOR FEEDING DRILLS Filed March 6, 1923 an A ATTORNEY Middle :3 as rarest T series.

DAVID C. KLA'U'SMEYER, OF CINCINNATI, OHIO, ASSIG'NOR TO THE CINCINNATI BICK- FORD TOOL COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

SAFETY HANDWHEEL FOR FEEDING DBILLS.

T 0 all whom it may concern Be it known that I, DAVID C. KLAUSMEYER, a citizen of the United States, and residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented a new and Improved Safety Handwheel for Feeding Drills, of which the following specification is a full disclosure. v

This invention relates to 'a sub-combination in the organization of power-drills providing a variety ofsp'eeds for advancing the drill into its work; the invention making 7 provision for a manual feed and the mechanism being such that the hand-wheel cannot derive motion from the'power.

Drilling machines have habitually been provided with a hand-wheel for accomplishing the feed manually and this hand-wheel has been azffixed to a shaft so as to rotate therewith when the power is used for feedin'g purposes. Such an arrangement, however, introduces a pronounced element of danger because in modern drilling machines, the power speeds are such as to cause the hand-Wheel to rotate at speeds as high as from three hundred to five hundred revolutio-ns per minute. Necessarily the handwheel is an exposed element and is thus a menace to the operator.

The present invention eliminates this menace and its aim is to attain that object in a simple and reliable manner involving comparatively few additional features of construction. By this arrangement, the user is enabled to bring into action any one of a series of speed-changes without causing motion to be imparted to the normally idle hand-wheel and, on the other hand, to set the parts so that the hand-wheel will be efi'ective to accomplish the feed and simultaneously the power will be maintained wholly outof action. V 7

Other objects and advantages will be in part indicated in the following description and in part rendered apparent therefrom in connection with the annexed drawings.

To enable others skilled in the art so fully to apprehend the underlying 'featureshereof that'they may embody the same in the various ways contemplated by this invention,

drawings depicting a preferred typical construction have been annexed as a part of this disclosure and, in such drawings, like Application filed March 6, 1923. Serial No. 623,191.

characters of reference denote corresponding parts throughout all the views, of which Fig. 1 is a transverse section taken through that portion of a drilling machine which involves the feeding mechanism and the means for varying the rate of feed under power, as well as the hand-wheel for manually accomplishing the advance of the drillspindle. Fig. 2 is a minor section in the plane of line 2-2 while Fig. 3 is a minor transverse section in the plane of the line 33.

The frame or casing is of appropriate contour as indicated by 17. In this frame is suitably mounted a worm-wheel 31 which is indicated diagrammatically and represents a conventional element forming a part of a spindle feeding arrangement such as may be utilized for advancing the spindle of a drilling machine; as will be readily understood by those skilled in the art. The power is imparted to the mechanism by a power-shaft 13 which, through the coupling 14, is connected with a shaft 15 journaled at one end in a bearing 47 and at its other end in a bushing 16 which is mounted in the frame 17. Parallel with the power-driven shaft 15 is a tubular shaft 18 which is likewise appropriately journaled at its ends in the frame 17 and which admits of being connected so as to be driven either bythe power or by hand, as will be presently described. This tubular shaft 18 has a somewhat reduced end 48 and an intermediate portion 49 which is enlarged in diameter and is machined to provide the three integral keys 46 shown more clearly by 2. In this, or any other suitable manner, a worm 28 is keyed to the tubular shaft 18; this worm being permanently in mesh with the aforesaid wormwheel 31. To reduce the friction of the endthrust of the worm 28, a ball-bearing 30 may be employed, and a like hearing 29 reduces the tendency of the gears to rotate the worm and shaft when the power is disengaged.

A variety of power speeds may be imparted to the tubular shaft 18-through the instrumentality of a nest of spur-gears 1, 3, 5, 7, 9'and 11 keyed to the shaft 15 and meshing respectively with companion-gears 2, 4, 6, 8, 10 and 12 loosely mounted on the hollow shaft 18 so as to rotate freely thereon except when independently engaged therewith. This engagement is effected by means ofa drive-key which can be shifted from point to point. The shifting of the drivekey is accomplished through a suitable handwheel or lever (not shown) which is appropriately connected to a pinion iournaled in the frame .17. This pinion engages a circular rack 24 which is formed on the rear end of a shift-rod 23 extending through the bore of the tubular shaft 18 and adapted to rotate therewith in its various longitudinal positions. Being circular, the rack 24 may rotate continually in engagement with the pinion 25 without altering its longitudinal position and any rotation of the pinion 25 will, in like manner, control the longitudinal position of the rod 23 so that movement may be effected when the parts are rotating as well when they are stationary. The shiftrod 23 has a diametral slot 50 in which is contained the drive-key 20; the latter being flat and held in place by a pivot 22. An expa-nsile spring 21 iscontained in a socket 51 in the shift rod 23 and this spring bears against a part of the drive-key so as to urge its tongue 62 radially outward. This tongue passes through a radial slot 19 formed through the wall of the tubular shaft 18. Each of the gears on the shaft 1.8 are provided with one or more key-ways 27 so that the tongue 52 of the drive-key 20 may, under the pressure of the spring 21. enter the keyway in any one of the gears 2, 4, 6,8, 10 or 12 (accordingto the position of the shift-rod 23) and thuslock the particular gear to the tubular shaft 18 and cause that shaft to be rotated at the particular speed determined by the gear-set then in an operative connection. In order to avoid any interference when the drive-key is being moved from gear to gear, a separator 45 intervenes between each ad joining gear and this separator is in the form of an annular flat ring which is loosely journalcd' on the'hollow shaft 18 and has the diameter of its bore only 'very slightly greater than the shaft 18. In consequence of the separators 45, the drive-key 2O caused to withdraw entirely from the'keyway in any one gear before it is permitted to enter the key-way of any adjacent gear and thus there can be no interference when the rate offeed is being changed. i

The manual feed is accomplished by means of a hand-wheel 39 which may provide the usual handle 40. This hand-wheel is journaled loosely on the reduced end 48 of the tubular shaft 18 and it is held in place as, for example by a bushing 38' which enters a countenbore in its hub 36, the bushing being secured to the shaft 18 by a pin 37. r

The connection between the hand-wheel and the worm-supporting shaft 18 is established and broken automatically according to whether or not the change-gears are disconnected or connected, asthe case. maybe,

lar shaft 18 has its forward end projecting into the bore of the hand-wheel as indicated by 48 and that'portion has also an elongated" radial slot denoted by 35 through which the drive key projects. The 'hubof the handwheel has slots 33 which are adapted to be entered by the drive-key (when the latter is in the position shown by the drawings) with the result thatqthe hand-wheel is. locked to' the shaft 18 and, when manipulated, is enabled to turn said'shaftand hencethe worm 28 can thus accomplish a'feeding of the drill spindle. In this position, however,

the other drive-key 20 iswholly detached from anyof the gears; this result being accomplished by locating a collar '44'th'e same distance from the slot .33. as the drive-keys 20 and 34 are apart. This collar 44' has a smooth bore 'andi's adapted to force the drive key 20 out of action as shown by the drawings when the drive key 33 isin its 1 operative position. Conversely, when the rod 23 is shifted to bring thegdrive-key 20 into engagement with: any of-thergears the other drive-key 34 is caused to ride idly on the smooth bore of either the bushing 38 or the bushing 53; thus'releasing the hand. wheel. This hand-wheel thenmerely. floats Inc on the end of the rotating shaft 18 and,'save for a slight friction, is not subjected to any rotatingforce. :To. offset that slight friction, if desired, the'hand-wheel may be'made of light material ormay be more or less independently supported and subjected to a slight retarding friction; as for example, by

means of an annular ringor gibs'denoted by 42 and retained in place against the frame 17 by means of suitable bolts 43. Thehub of the hand-wheel may be provided with a flange 41 interfitting with .said gibs sufli ciently closely to keep the hand-wheel from being rotated unduly when dis-engaged from its positive connection with the power-shaft.

It will thus be 883111111211] this invention is well adapted to accomplish the objects aforesaid in a simple manner and that the'organization is very self-contained'andzpermitsthefeeding of the spindle to be accom plished either manually. or'at any one oft-a plurality of immediately available power- 7 speeds.

Withoutfurther analysis, the foregoing will so fully reveal the gist of this inven tion that others'can, by applying current knowledge, readily adapt it for: various utilizations byretaining one onmore of the i eo all ravages at essential characteristics of either the generic or specific aspects of this invention, and, therefore, such adaptations should be, and are intended to be, comprehended within the meaning and range of equivalency of the following claims.

Having thus revealed this invention, 1 claim as new and desire to secure the following combinations and elements, or equivalents thereof, by Letters Patent of the United States:

1. A drilling-machine combining spindlefeeding mechanism including a rotatable shaft; a power-driven shaft; a series of gear-sets; manually-operated means for operatively connecting said twoshafts through any one only of said gear-sets; a hand-wheel adapted to be connected to said first-men tioned shaft for its manual operation; and a device for controlling said connection, the position of said device being so determined by the manual means for connecting the gear-sets that said hand-wheel will be positively connected to its shaft only when none of the gear-sets is operative to move the spindle-feeding mechanism.

2. A safety-control for drilling-machines combining a power driving-shaft and a plurality of gear-sets; a spindlefeeding mechanism including a driven shaft; a handwheel journaled adjacent one end of said driven shaft; an instrumentality for connecting said hand-wheel with said driven shaft only when it is disconnected from all of the gear-sets and for connecting any one of said gear-sets with said driven-shaft only when said hand-wheel is disconnected from it; and manual means for determining the position of said instrumentality.

3. A drilling-machine combining a tubular driven-shaft; a hand-wheel journaled adjacent one end of said shaft; a plurality of gears journaled to rotate independently of said shaft; at shift-rod arranged in the bore of said driven-shaft and having a first drive-key adjacent said hand-wheel and a second drive-key adjacent said gears; said gear-shaft and hand-wheel being provided with slots for said drive-keys; the slot in said hand-wheel being short in length and so distanced from the several gears that the second drive-key will be out of registry with all of said gears when the first drive-key has engaged the slot in the hand-Wheel; and manual means for longitudinally positioning said shift-rod.

4:. A drilling-machine combining a spindle-feeding mechanism including a tubular shaft having ad'acent each end an elongated slot; a shift-r in the bore of said shaft and having two drive-keys slidable in said slots and adapted to project therethrough; a plurality of gears including an idle element mounted in registry with one of said elongated slots; a hand-wheel journaled adjacent the other end of said shaft and having a hub-portion provided with a short key-way so distanced from said idle element that when a drive-key engages the handwheel the other drive-key will register with said idle element; means for holding said first-mentioned drive-key out of engagement with said hand-wheel when the other drivekey is in registry with any of said gears; and a manually operative device for shifting said rod, said device comprehending a connection adapted to enable said shift-rod to be rotated without disturbing its position.

5. A drilling-machine comprising a spindle-feeding-mechanism including a drivenshaft; a frame; a hand-wheel journaled on said frame and having a hub-portion cir-- cumscribing one end of said shaft; a plurality of change-gears; and manual means for operatively connecting said hand-wheel to said shaft only when all of the gears are disconnected, and for connecting any one of said gears with said shaft only when said hand-wheel is disconnected.

6. A drilling-machine combining a spindle-feeding mechanism including a tubular shaft; a pinion adapted to be rotated. by

hand; a shift-rod in the bore of said shaft;

and having its end projecting therefrom in the form of a circular rack engaging the teeth of said pinion whereby said shift-rod when rotated may be shifted or held against shifting by said pinion; a plurality of gearsets; a hand-wheel; and means controlled by said shift-rod for effecting an engagement between saidtubular shaft and each of said gear-sets only when said hand-wheel is disengagedand, for operatively connecting said hand wheel to said shaftonly when all of the gears are disconnected.

In witness whereof, I hereunto subscribe my name, as attested by the two subscribing witnesses.

DAVID C. KLAUSME YER.

Witnesses:

G. C. SLETE, L. G. Knox. 

